Method and System for Acquiring and Processing Impact Strain and Rotational Speed ​​Information of Rolling Bearing Cage

Abstract

This application discloses a method and system for acquiring and processing impact strain and rotational speed information of rolling bearing cages. The method includes: acquiring impact strain signals, rolling element rotational speed signals, and cage rotational speed signals; plotting an original rotational speed information diagram based on the rolling element rotational speed signals and cage rotational speed signals; acquiring the speed turning moments in the original rotational speed information diagram; inverting the rotational speed information between every two adjacent speed turning moments in the original rotational speed information diagram to obtain a true rotational speed information diagram; determining the rotational speed difference between the rolling elements and the cage based on the rotational speed information in the true rotational speed information diagram; and extracting the collision moment and corresponding impact strain from the impact strain signals to determine the mapping relationship between impact strain and rotational speed difference. This application has the advantages of simple processing method and high synchronous information acquisition and processing rate, and the mapping relationship between impact strain and rotational speed is highly accurate.

Description

Technical Field

[0001] This application relates to the field of rolling bearing technology, and in particular to a method and system for acquiring and processing information on impact strain and rotational speed of rolling bearing cages. Background Technology

[0002] Rolling bearings are a critical component of rotating machinery, serving as a vital structure for transmitting loads between the bearing housing and the rotating shaft. In practical applications, the high-speed rotation of rolling bearings can easily lead to cage failure, causing abnormal bearing vibration, which in turn reduces the performance and reliability of rotating machinery, affecting its service life. Therefore, it is necessary to use measuring devices to obtain the impact strain signal between the rolling elements and the cage under high-speed operation, and to process the impact strain signal to extract useful information.

[0003] However, the accuracy of the mapping relationship between impact strain and rotational speed obtained during signal processing after the impact strain signal is currently low, which seriously affects the subsequent detection and diagnosis of rolling bearings. Summary of the Invention

[0004] This application provides a method and system for acquiring and processing information on impact strain and rotational speed of rolling bearing cages, in order to solve the problem that the mapping relationship between impact strain and rotational speed obtained in the signal processing process of the prior art is not accurate.

[0005] On the one hand, embodiments of this application provide a method for acquiring and processing information on impact strain and rotational speed of rolling bearing cages, including:

[0006] Acquire impact strain signals, rolling element speed signals, and cage speed signals;

[0007] A graph of the original rotational speed information is drawn based on the rolling element rotational speed signal and the cage rotational speed signal;

[0008] Obtain the speed turning time from the original rotational speed information graph;

[0009] Invert the speed information between every two adjacent speed turning moments in the original speed information graph to obtain the true speed information graph;

[0010] Determine the speed difference between the rolling elements and the cage based on the speed information in the actual speed information diagram;

[0011] The collision time and corresponding impact strain are extracted from the impact strain signal to determine the mapping relationship between impact strain and rotational speed difference.

[0012] On the other hand, embodiments of this application provide a rolling bearing cage impact strain and speed information acquisition and processing system, including:

[0013] The measuring device is used to acquire impact strain signals, rolling element speed signals, and cage speed signals;

[0014] Processing apparatus, comprising:

[0015] The original information diagram drawing module is used to draw the original speed information diagram based on the rolling element speed signal and the cage speed signal;

[0016] The steering moment extraction module is used to obtain the speed steering moment from the original speed information graph;

[0017] The real speed information graph drawing module is used to invert the speed information between every two adjacent speed turning moments in the original speed information graph to obtain the real speed information graph.

[0018] The speed difference determination module is used to determine the speed difference between the rolling elements and the cage based on the speed information in the real speed information diagram.

[0019] The mapping relationship determination module is used to extract the collision time and corresponding impact strain from the impact strain signal and determine the mapping relationship between impact strain and rotational speed difference.

[0020] The method and system for acquiring and processing information on impact strain and rotational speed of rolling bearing cages in this application have the following advantages:

[0021] The processing method is simple, the information is collected and processed at a high rate, and the mapping relationship between impact strain and rotational speed is highly accurate. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A flowchart illustrating the method for acquiring and processing information on impact strain and rotational speed of a rolling bearing cage provided in an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the overall structure of the measuring device provided in the embodiments of this application;

[0025] Figure 3 This is a schematic diagram of the impact collision module provided in an embodiment of this application;

[0026] Figure 4 This is a schematic diagram of the crank-rocker mechanism provided in the embodiments of this application;

[0027] Figure 5 This is a schematic diagram of the original rotational speed signal acquired by the encoder provided in an embodiment of this application;

[0028] Figure 6 This is a schematic diagram of the actual rotational speed signal acquired by the encoder provided in the embodiments of this application;

[0029] Figure 7 This is a schematic diagram of the speed difference signal between the rolling element and the cage provided in an embodiment of this application;

[0030] Figure 8 This is a schematic diagram illustrating the mapping relationship between impact strain and rotational speed difference provided in an embodiment of this application.

[0031] Explanation of reference numerals in the attached drawings: 1-Impact collision module, 11-Roller, 12-Rolling element speed encoder, 13-Signal acquisition line, 14-Strain gauge, 15-Rolling element, 16-Cage, 17-Cage speed encoder, 2-Crank rocker mechanism, 3-Drive unit, 4-Mounting platform, 5-Data acquisition and display module. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] Figure 1 A flowchart illustrating the method for acquiring and processing impact strain and rotational speed information of a rolling bearing cage according to an embodiment of this application. This embodiment of the application provides a method for acquiring and processing impact strain and rotational speed information of a rolling bearing cage, including the following steps:

[0034] S100 acquires impact strain signals, rolling element speed signals, and cage speed signals.

[0035] Exemplarily, this application employs as follows Figure 2-4The measuring device shown acquires impact strain signals. This measuring device includes: a rolling element-cage impact collision module 1, a crank-rocker mechanism 2, a drive unit 3, a mounting platform 4, and a data acquisition and display module 5. The rolling element-cage impact collision module 1 includes a roller 11, a strain gauge 14, and a cage speed encoder 17. The roller 11 is used to mount the cage 16 and rolling elements 15 to be measured. The strain gauge 14 is mounted on the crossbeam of the cage 16 and is used to acquire the impact strain signal generated by the impact collision between the rolling elements 15 and the cage 16. The cage speed encoder 17 is located at the other end of the roller 11 and is used to detect the rotational speed of the cage 16. The crank-rocker mechanism 2 includes a crank-rocker and a rolling element speed encoder 12. One end of the crank-rocker is vertically rotatably connected to one end of the roller 11, and the connection point between the crank-rocker and the roller 11 is offset from the axis of the roller 11. A rolling element speed encoder 12 is installed at the connection between the roller 11 and the crank rocker arm. The rolling element speed encoder 12 is used to detect the rotational speed of the rolling element 15. Both the rolling element speed encoder 12 and the cage speed encoder 17 are electrically connected to the data acquisition and display module 5. The data acquisition and display module 5 is also used to acquire the rolling element speed signal generated by the rolling element speed encoder 12 and the cage speed signal generated by the cage speed encoder 17. The drive unit 3 is rotatably connected to the other end of the crank rocker arm, and the connection point between the crank rocker arm and the drive unit 3 is offset from the axis of the drive unit 3. The roller 11 is rotatably mounted on the mounting platform 4, and the drive unit 3 is also mounted on the mounting platform 4. The data acquisition and display module 5 includes a data acquisition unit, a data analysis unit, and a data display unit. The data acquisition unit is electrically connected to the strain gauge 14, the rolling element speed encoder 12, and the cage speed encoder 17 via a signal acquisition line 13. The data acquisition and display module 5 is used to acquire the impact strain signal generated by the strain gauge 14, analyze and determine the data corresponding to the impact strain signal generated by the strain gauge 14, the rolling element speed signal generated by the rolling element speed encoder 12, and the cage speed signal generated by the cage speed encoder 17. After obtaining the data, the data acquisition and display module 5 is also used to display the data.

[0036] The specific structure of the measuring device in this application has been described in the invention patent application with publication number CN114046952A, and this application will not describe its specific structure in detail.

[0037] S110, draw the original speed information diagram based on the rolling element speed signal and the cage speed signal.

[0038] For example, the rolling element speed signal and the cage speed signal acquired by the rolling element speed encoder 12 and the cage speed encoder 17 are extracted as VE1 and VE2 respectively, and the resulting original speed information diagram is shown below. Figure 5 As shown.

[0039] S120, obtain the speed turning time in the original speed information graph.

[0040] For example, a local minimum (MIN) function can be used to determine whether the rolling elements and the cage are rotating in opposite directions. If so, the corresponding moment is obtained as the velocity reversal moment T. i (MIN). The obtained speed turning moment is... Figure 5 The middle circle indicates the location.

[0041] S130: Invert the speed information between every two adjacent speed turning moments in the original speed information graph to obtain the true speed information graph.

[0042] For example, T can be used i (MIN) and T i+1 Invert the rotational speed information between (MIN) time points, i.e., -VE1 and -VE2, and redraw the plot to obtain the following result: Figure 6 The actual rotational speed information shown is displayed in the graph; the updated rotational speed information is VE. R1 With VE R2 .

[0043] S140, determine the speed difference between the rolling elements and the cage based on the speed information in the actual speed information diagram.

[0044] For example, it can be done according to the formula Vd = VE R1 -VE R2 Determine the speed difference Vd, such as Figure 7 As shown.

[0045] S150, extract the collision time and corresponding impact strain from the impact strain signal, and determine the mapping relationship between impact strain and rotational speed difference.

[0046] For example, the extracted impact strain is as follows Figure 8 As shown in S1, S2, S3, and S4, the determined mapping relationship is as follows: Figure 8 As shown.

[0047] This application embodiment also provides a rolling bearing cage impact strain and speed information acquisition and processing system, the system comprising:

[0048] The measuring device is used to acquire impact strain signals, rolling element speed signals, and cage speed signals;

[0049] Processing apparatus, comprising:

[0050] The original information diagram drawing module is used to draw the original speed information diagram based on the rolling element speed signal and the cage speed signal;

[0051] The steering moment extraction module is used to obtain the speed steering moment from the original speed information graph;

[0052] The real speed information graph drawing module is used to invert the speed information between every two adjacent speed turning moments in the original speed information graph to obtain the real speed information graph.

[0053] The speed difference determination module is used to determine the speed difference between the rolling elements and the cage based on the speed information in the real speed information diagram.

[0054] The mapping relationship determination module is used to extract the collision time and corresponding impact strain from the impact strain signal and determine the mapping relationship between impact strain and rotational speed difference.

[0055] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0056] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A method for acquiring and processing information on impact strain and rotational speed of a rolling bearing cage, characterized in that, include: Acquire impact strain signals, rolling element speed signals, and cage speed signals; A graph of the original rotational speed information is drawn based on the rolling element rotational speed signal and the cage rotational speed signal. Obtain the speed turning time from the original rotational speed information graph; Invert the rotational speed information between every two adjacent speed turning moments in the original rotational speed information graph to obtain the true rotational speed information graph; The speed difference between the rolling elements and the cage is determined based on the speed information in the actual speed information diagram; The collision time and corresponding impact strain are extracted from the impact strain signal to determine the mapping relationship between the impact strain and the rotational speed difference.

2. The method for acquiring and processing information on impact strain and rotational speed of a rolling bearing cage according to claim 1, characterized in that, The step of obtaining the speed turning time in the original rotational speed information graph includes: A local minimum function is used to determine whether the rolling elements and the cage are rotating in opposite directions. If they are rotating in opposite directions, the corresponding time is obtained and used as the speed reversal time.

3. The method for acquiring and processing information on impact strain and rotational speed of a rolling bearing cage according to claim 1, characterized in that, Determining the speed difference between the rolling element and the cage based on the speed information in the actual speed information diagram includes: The difference between the rolling element speed information and the cage speed information in the actual speed information graph is determined as the speed difference.

4. A rolling bearing cage impact strain and speed information acquisition and processing system, characterized in that, include: The measuring device is used to acquire impact strain signals, rolling element speed signals, and cage speed signals; Processing apparatus, comprising: The original information diagram drawing module is used to draw an original speed information diagram based on the rolling element speed signal and the cage speed signal; The steering time extraction module is used to obtain the speed steering time from the original rotational speed information graph; The real speed information graph drawing module is used to invert the speed information between every two adjacent speed turning moments in the original speed information graph to obtain the real speed information graph. The speed difference determination module is used to determine the speed difference between the rolling element and the cage based on the speed information in the real speed information diagram. The mapping relationship determination module is used to extract the collision time and corresponding impact strain from the impact strain signal, and determine the mapping relationship between the impact strain and the rotational speed difference.

5. The rolling bearing cage impact strain and speed information acquisition and processing system according to claim 4, characterized in that, The measuring device includes: Impact collision module (1), including: Roller (11) for mounting the cage (16) and rolling elements (15) to be measured; A strain gauge (14) is disposed on the crossbeam of the cage (16), and the strain gauge (14) is used to acquire the strain signal generated by the impact collision between the rolling element (15) and the cage (16); The crank-rocker mechanism (2) includes: A crank rocker arm, one end of which is vertically rotatably connected to one end of the roller (11), and the connection point between the crank rocker arm and the roller (11) is offset from the axis of the roller (11); The drive unit (3) is rotatably connected to the other end of the crank rocker arm, and the connection point between the crank rocker arm and the drive unit (3) is offset from the axis of the drive unit (3); The data acquisition and display module (5) is electrically connected to the strain gauge (14) and is used to acquire the impact strain signal generated by the strain gauge (14).

6. The rolling bearing cage impact strain and speed information acquisition and processing system according to claim 5, characterized in that, The impact collision module (1) also includes: A cage speed encoder (17) is disposed at the other end of the roller (11), and the cage speed encoder (17) is used to detect the rotational speed of the cage (16); The crank-rocker mechanism (2) further includes: A rolling element speed encoder (12) is disposed at the connection between the roller (11) and the crank rocker arm. The rolling element speed encoder (12) is used to detect the rotational speed of the rolling element (15). The rolling element speed encoder (12) and the cage speed encoder (17) are both electrically connected to the data acquisition and display module (5). The data acquisition and display module (5) is also used to acquire the rolling element speed signal generated by the rolling element speed encoder (12) and the cage speed signal generated by the cage speed encoder (17).

7. The rolling bearing cage impact strain and speed information acquisition and processing system according to claim 5, characterized in that, Also includes: The mounting platform (4) is provided with the roller (11) rotatably mounted on the mounting platform (4) and the drive unit (3) is also mounted on the mounting platform (4).

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